The Test Request <1> message forces a heartbeat from the opposing application. The Test Request <1> checks sequence numbers and verifies line status. The opposite application responds to the Test <1> with a Heartbeat <0> containing the TestReqID <112>.
| Tag | Field Name | Required | Comments |
|---|---|---|---|
| Standard Header | Yes | MsgType <35> = 1 | |
| 112 | TestReqID | Yes | Identifier included in Test Request <1> message to be returned in resulting Heartbeat <0> |
| Standard trailer | Yes |